5. Honwzygosphaeia triarcha. 

 Markai.i, 1955 B.) 



6. Homozys^osphaera tholiferu 

 Markali, 1955 B.) 



7. Exiniaella haliica. Detail of electron-micrograph of theca 

 and NoRDi 1. 1955.) 



Pi. 11 1. Ciystallolithiis hyalinus. Electron-micro- 

 graph of coccolith. (From Gaarder 

 and Markali, 1955.) 



2. Spluieiocalyptia papiUifeiu. Electron- 

 micrograph of coccolith. (From Hall- 

 dal and Markali, 1954 a.) 



3. Hoinozygospluiera wettsteini. Electron- 

 micrograph of coccoliths. (By courtesy 

 of J. Markali.) 



4. Calyptiosphaeruohloni^'ii. Electron-micro- 

 graph of coccoliths. (From Halldal 

 and Markali, 1955 b.) 



Electron-micrograph of coccolith. (From Halldal and 



Electron-micrograph of coccolith. (From Halldal and 



(From Braarud, Markali 



